[Paraview] Re: Transparent surface and picture export problem

[Milan Frank]

Here is a little update about the issue. The fore mentioned problem is
clearly related with the usage of the depth peeling algorithm (It is
switched off on the ATI cards). When I explicitly turn off the
DepthPeeling on nVidia cards, my picture export runs without any
problems.

Milan.

On 03/07/07, Milan Frank <milan.frank at gmail.com> wrote:
> Hi All,
>
> I am badly stucked with a hard to track problem. I am using Python
> interface to ServerManager. I would like to ask the public if there is
> someone else experiencing the same behavior.
>
> The problem is:
> I am using the vtkWindowToImageFilter object to get a screen shot of
> the renderer. Since such a screen shot, the renderer is unable to plot
> a scene with semi transparent objects anymore. It looks like the
> renderer does not refresh the window content. There is no warning, no
> exception. It somehow recovers, when the opacity is reset to one.
>
> This problem seems to be hardware-dependent. I have tested the problem
> on several machines. They are all running Windows XP. We are
> experiencing the problem on nVidia graphics cards only. ATIs are fine.
>
> OK - ATI Radeon X1800 Go
> OK - ATI Radeon 9250
> Err - nVidia GeForce 5300 Go
> Err - nVidia Quadro Fx 1400 Go
> Err - nVidia GeForce 7900 GS
>
> I guess, it is vaguely related to this discussion.
> http://public.kitware.com/pipermail/paraview/2006-November/004154.html
>
> Where there any changes, in to code, related to this issue?
>
> I have noticed that on nVidia cards we are not experiencing the fore
> mentioned mottled surfaces. Unfortunately, the framerate is
> significantly lower and we have this picture-export-bug. There is a
> lot better framerate on the ATI cards and no problem with the export.
> However, the transparent surface is mottled.
>
> Any hints would be really appreciated,
> Milan.
>